What are the valve color codes?

Color-coding valve tags is an important form of visual communication in industrial settings. When implemented correctly, a comprehensive system of color codes, symbols, and identification numbers helps employees quickly determine the valve's function and potentially the substance flowing through the connected pipeline, improving safety and efficiency.

The challenge is determining which colors to use for valve tags. A common practice is to mirror the colors used for adjacent pipe labeling, as the valve is fundamentally a component of that pipeline system. Most facilities in the US often adhere to standard color codes, such as those specified by the ANSI/ASME A13.1, while others may use custom color schemes for non-standard materials or industry-specific needs.

Understanding both standard and custom color codes is essential to establishing the safest and most effective valve tagging system for your facility. Let’s explore the common valve tag color codes to help you establish the optimal system for your operations.

Standard ANSI/ASME A13.1 Color Codes

The ASME/ANSI A13.1 recommends the following six standard color codes for pipe markings that most facilities apply to valve tagging as well:

• Yellow with Black Text: Flammable, Combustible, & Oxidizing Fluids.
• Green with White Text: Potable, Cooling, Boiler Feed Water.
• Blue with White Text: Compressed Air.
• Red with White Text: Fire Quenching Fluids.
• Orange with Black Text: Toxic & Corrosive Fluids.
• Gray with Black Text: Steam, Steam Condensate, & other Hot Water.

Custom Color Codes for Valve Tags

For materials or functions that do not fit into the ASME/ANSI A13.1’s six standard categories, facilities are permitted by the ANSI/ASME to define their own internal color codes using user-defined color combinations, such as:

• Purple with White Text: Specific hazards or utilities not covered by standard colors
• Black with White Text: Custom product categories
• White with Black Text: Custom labels requiring high contrast
• Brown with White Text: Specific pipelines not covered by predefined colors

When implementing a custom color scheme for pipe labels and valve tags, it is essential to clearly document the meanings and train all personnel to ensure safety and clarity.

Other Industry and Substance Specific Color Codes

While the ASME/ANSI standard is widely adopted in the US, other businesses and industries require additional or alternative guidelines for specific applications. Here are some examples:

• Healthcare Facilities: The NFPA 99/CGA C‑9 standards provide medical substance pipe marking and vacuum shutoff valve tagging guidelines in these facilities.
• Ammonia Refrigeration: Pipe labels and valve tags in ammonia refrigeration use color codes defined by the IIAR Bulletin 114.
• Marine Environments: Pipe labels and valve tags in marine environments follow international standards like ISO 14726.

With an understanding of these various color codes for valve tags, you can make informed decisions about what best meets the specific needs of your facility. Once you have chosen the color codes, focus on other important elements, such as the identification number on the tags. Ensure that the identification number is clear, standardized, and easily readable to prevent human error and improve safety. Also, be sure to consider compliance requirements as well, as proper valve identification and pipe labeling are often mandated by law.